. if you could stand by, we're going to go to watertown right now and just updating.theselawenforcementofficials say the activity overnight they have been dealing with, including the killing of one of the two suspects in the boston marathon bombing, they are directly related to the bombing. the two suspects have military experience and appear to have been in the u.s. for as long as a year, officials tell nbc news. and may have international ties. with that information, joining us now from watertown, massachusetts, is michael isikoff, who's there on the scene. michael, what can you tell us? >> reporter: well, these are two cold-blooded terrorists, in the words of police. we saw a pretty brazen example of that tonight. here's the sequence of events as we understand them right now. at about 10:20 last night, there's a robbery at a 7-eleven in cambridge. after that, an m.i.t. police officer was shot and killed in his head. at that point, the two suspects who are the suspects in the boston marathon bombing, engage in a carjacking and seize a black mercedes suv. the victim in that case, the

and this is "way too early," the show that tips our captolawenforcementand we mark one week since the marathon bombings. monday, april 22nd. >>> the boston bombings impact on the immigration debate as lawmakers move forward with legislation. could the fact that the suspects are foreigners change the focus of the discussion and the impact of the sequester? planning to fly sometime soony why the faa says today is the first day travelers will really feel the effects. >>> we'll get to the latest on the boston investigation in a moment. >>> first developing news overnight in washington state. at least five people were killed by gunfire at an apartment building in a suburb south of seattle. among the dead a suspect who was shot by police officers on the scene. another two bodies found in the parking lot and two more bodies were found inside the building. we'll bring you the updates on this latest gun tragedy as we get them. >>> bells will ring at 2:50 to mark one week since the deadly marathon bombings struck and according to investigators the lone surviving suspect, dzhokhar tsarnaev, is responding

was used as the delivery device for theexplosives.lawenforcementsources tell nbc news that the bombs were built to act like homemade ieds. and take a look at what remains of the black duffle back used to conceal the device. sources tell nbc news the bombs appeared to include a battery pack and the "boston globe" reporting investigators recovered part of a circuit board at the scene. the bombs were also packed with shrapnel to maximize damage and a black powder known as low explosive. in other words, the device was not capable of creating a massive blast wave, instead, the main purpose was simply to maim and to injure fans at the event. photos obtained by whdh in boston showed the area where the bomb was left moments before and moments after the detonation. the fbi is looking at these photos and others like them for clues as to who placed the bombs and when they may have placed them. there is precedent for devices like these. in 2004, the fbi sent out a memo on the use of homemade pressure cooker bombs. al qaeda's online magazine gave instructions for making them just last month. and

of a man in a white baseball hattolawenforcementagencies. that, despite a confusing day of reports yesterday, that a suspect had been arrested. they're going through surveillance cameras and civilians. that has helped lead authorities to a person who set down a beautiful bag at the site of the second explosion. authorities have been recovering evidence from the scene, beebes to shrapnel. the pressure cooker. the lid landed on top of a nearby building. they're trying to trace the orig origin. meanwhile, the boston federal courthouse was evacuated yesterday afternoon. employees said they were told a code red was in effect and ordered to leave. all of this added up to a tense day that ended in no resolution. joining us from boston, chris jansing. take us through how president obama will spend his day and the developing situation, chris? >> reporter: good morning. i'm right across the street from holy cross cathedral. and the president will be arriving here for an 11:00 a.m. service. we've got a look at the program. it will include religious leaders, the mayor will be here. governor de

delayed so passengers, advocatesandlawenforcementexperts can weigh in. the tsa plan to allow knives with small blades on planes starting this thursday. it would have been the first time they would have been back on passenger planes since september 11th, 2001. >>> new york city at it again. it may become the biggest city in america to raise the legal age for buying cigarettes to 21. the city already opposes the highest cigarette taxes in the country. it also bans smoking in bars, parks and beaches while launching graphic advertising campaigns about the hazards of smoking. smokers of retailers say those restrictions are nannyish and bad for business. it aims at stopping young people from developing a habit that is the leading causes of death. they say the measure would drive younger smokers to neighboring communities t. hearing on the proposal set for may 2nd. i have a funny feeling joe and mika will have more to say about that story. the folk singer guitars who opened the woodstock festival in 1969 died on monday. ♪ sometimes i feel like i'm in time. >> rich chi haven's family said